object_fwd.hpp
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//
// MessagePack for C++ static resolution routine
//
// Copyright (C) 2008-2018 FURUHASHI Sadayuki and KONDO Takatoshi
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef MSGPACK_V3_OBJECT_FWD_HPP
#define MSGPACK_V3_OBJECT_FWD_HPP
#include "msgpack/v3/object_fwd_decl.hpp"
#include "msgpack/object_fwd.hpp"
namespace msgpack {
MSGPACK_API_VERSION_NAMESPACE(v3) {
#if !defined(MSGPACK_USE_CPP03)
namespace adaptor {
// If v2 has as specialization for T, then dispatch v2::adaptor::as<T>.
// So I call v2::has_as<T> meta function intentionally.
template <typename T>
struct as<T, typename std::enable_if<v2::has_as<T>::value>::type> : v2::adaptor::as<T> {
};
} // namespace adaptor
template <typename T>
struct has_as {
private:
template <typename U>
static auto check(U*) ->
typename std::enable_if<
// check v3 specialization
std::is_same<
decltype(adaptor::as<U>()(std::declval<msgpack::object>())),
U
>::value
||
// check v2 specialization
v2::has_as<U>::value
||
// check v1 specialization
v1::has_as<U>::value,
std::true_type
>::type;
template <typename...>
static std::false_type check(...);
public:
using type = decltype(check<T>(MSGPACK_NULLPTR));
static constexpr bool value = type::value;
};
#endif // !defined(MSGPACK_USE_CPP03)
} // MSGPACK_API_VERSION_NAMESPACE(v3)
} // namespace msgpack
#endif // MSGPACK_V3_OBJECT_FWD_HPP
msgpack::true_type
integral_constant< bool, true > true_type
Definition: cpp_config_decl.hpp:59
object_fwd.hpp
msgpack::adaptor::as
Definition: object_fwd_decl.hpp:62
msgpack
Definition: adaptor_base.hpp:15
msgpack::has_as::type
decltype(check< T >(MSGPACK_NULLPTR)) type
Definition: object_fwd.hpp:65
msgpack::enable_if
Definition: cpp_config_decl.hpp:56
MSGPACK_API_VERSION_NAMESPACE
#define MSGPACK_API_VERSION_NAMESPACE(ns)
Definition: versioning.hpp:58
msgpack::false_type
integral_constant< bool, false > false_type
Definition: cpp_config_decl.hpp:62
msgpack::has_as
Definition: object_fwd.hpp:53
MSGPACK_NULLPTR
#define MSGPACK_NULLPTR
Definition: cpp_config_decl.hpp:35
object_fwd_decl.hpp